CBSE Class 12 Chemistry Notes: Haloalkanes – Relative Reactivity towards SN1 and SN2 Reactions

RELATIVE REACTIVITY OF HALOALKANES TOWARDS SN¹ AND SN² REACTIONS:

• For SN² mechanism as the steric hind rence of larger alkyl groups in increases the reactivity is get decreases. Thus the reactivity order will be follows.

Methyl halides > Primary halides > Secondary halide > tertiary halides

• In contrast in SN¹ reactions the carbocations are intermediates. Thus greater the stability of the carbocations more stable it will be and hence have higher reactivity.

Thus as order of stability of carbocation is:-

• The primary benzlic halides show higher reactivity in SN¹ reactions than order simple primary halides.

Relation Reactivity of Haloalkanes:-

Greater the polarity of carbon halogen (C – X) bond more reactive should be the haloalkane thus reactivity of haloalkanes follows the order:-

RI >RBr>RCl> RF

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